Police found 12 adults and eight children when they went to a house in the Latrobe area, in Melbourne.
The woman who organised the party was fined.
Police also fined seven youths holding a house party in Warrnambool and a Hawthorn woman who was
found parked in St Kilda.
She had told the officer she was looking for a supermarket to buy toilet paper but got lost.
Of the fines, 20 were for not wearing a face mask outside of the homes and 69 were for breaches of the 8pm-5am Melbourne curfew.